Genesis 35:18, 22-26

And as her soul was departing (for she was dying), she called his name Ben-oni; but his father called him Benjamin.

While Israel lived in that land, Reuben went and lay with Bilhah his father’s concubine. And Israel heard of it. Now the sons of Jacob were twelve. The sons of Leah: Reuben (Jacob’s firstborn), Simeon, Levi, Judah, Issachar, and Zebulun. The sons of Rachel: Joseph and Benjamin. The sons of Bilhah, Rachel’s servant: Dan and Naphtali. The sons of Zilpah, Leah’s servant: Gad and Asher. These were the sons of Jacob who were born to him in Paddan-aram.